package com.smmpay.common.encrypt;

import java.security.MessageDigest;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/** 
 * 基础加密组件 
 *  
 * @version 1.0 
 * @since 1.0 
 */  
public abstract class Coder {  
    public static final String KEY_SHA = "SHA";  
    public static final String KEY_MD5 = "MD5";  
  
    /** 
     * MAC算法可�?以下多种算法 
     *  
     * <pre> 
     * HmacMD5  
     * HmacSHA1  
     * HmacSHA256  
     * HmacSHA384  
     * HmacSHA512 
     * </pre> 
     */  
    public static final String KEY_MAC = "HmacMD5";  
  
    /** 
     * BASE64解密 
     *  
     * @param key 
     * @return 
     * @throws Exception 
     */  
    public static byte[] decryptBASE64(String key) throws Exception {  
        return (new BASE64Decoder()).decodeBuffer(key);  
    }  
  
    /** 
     * BASE64加密 
     *  
     * @param key 
     * @return 
     * @throws Exception 
     */  
    public static String encryptBASE64(byte[] key) throws Exception {  
        return (new BASE64Encoder()).encodeBuffer(key);  
    }  
  
    /** 
     * MD5加密 
     *  
     * @param data 
     * @return 
     * @throws Exception 
     */  
    public static byte[] encryptMD5(byte[] data) throws Exception {  
  
        MessageDigest md5 = MessageDigest.getInstance(KEY_MD5);  
        md5.update(data);  
  
        return md5.digest();  
  
    }  
  
    /** 
     * SHA加密 
     *  
     * @param data 
     * @return 
     * @throws Exception 
     */  
//    public static byte[] encryptSHA(byte[] data) throws Exception {  
//  
//        MessageDigest sha = MessageDigest.getInstance(KEY_SHA);  
//        sha.update(data);  
//  
//        return sha.digest();  
//  
//    }  
  
    /** 
     * 初始化HMAC密钥 
     *  
     * @return 
     * @throws Exception 
     */  
//    public static String initMacKey() throws Exception {  
//        KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_MAC);  
//  
//        SecretKey secretKey = keyGenerator.generateKey();  
//        return encryptBASE64(secretKey.getEncoded());  
//    }  
  
    /** 
     * HMAC加密 
     *  
     * @param data 
     * @param key 
     * @return 
     * @throws Exception 
     */  
//    public static byte[] encryptHMAC(byte[] data, String key) throws Exception {  
//  
//        SecretKey secretKey = new SecretKeySpec(decryptBASE64(key), KEY_MAC);  
//        Mac mac = Mac.getInstance(secretKey.getAlgorithm());  
//        mac.init(secretKey);  
//  
//        return mac.doFinal(data);  
//  
//    }  
}  